50996721 has 8 divisors (see below), whose sum is σ = 68048640. Its totient is φ = 33971312.

The previous prime is 50996717. The next prime is 50996747. The reversal of 50996721 is 12769905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 50996721 - 2² = 50996717 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 50996721.

It is not an unprimeable number, because it can be changed into a prime (50996711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1590 + ... + 10223.

It is an arithmetic number, because the mean of its divisors is an integer number (8506080).

Almost surely, 2^50996721 is an apocalyptic number.

It is an amenable number.

50996721 is a deficient number, since it is larger than the sum of its proper divisors (17051919).

50996721 is a wasteful number, since it uses less digits than its factorization.

50996721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13255.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 50996721 is about 7141.1988489329. The cubic root of 50996721 is about 370.8350290823.

The spelling of 50996721 in words is "fifty million, nine hundred ninety-six thousand, seven hundred twenty-one".